function popup_image(image_url, title) {
		var winl = (screen.width - 200)/2;
		var wint = (screen.height - 300)/2;
		var settings ='top='+wint+',';
		settings +='left='+winl+',';
		settings +='width=200, ';
		settings +='height=300, ';
		settings +='scrollbars=no,';
		settings +='resizable=yes';

		title = title.replace(/\s/g, '%20');

		win=window.open('image_popup.php?image_url='+image_url+'&title='+title, 'image',settings);

		if(parseInt(navigator.appVersion) >= 4) {
			win.window.focus();
		}
	}

	function popup_gallery(g, i, w, h) {
		var winl = (screen.width - 700)/2;
		var wint = (screen.height - 500)/2;
		var settings ='top='+wint+',';
			settings +='left='+winl+',';
			settings +='width=700, ';
			settings +='height=500, ';
			settings +='scrollbars=no,';
			settings +='resizable=yes';

		win=window.open('/gallery_popup.php?g='+g+'&i='+i+'&w='+w+'&h='+h, 'image',settings);

		if(parseInt(navigator.appVersion) >= 4) {
		   win.window.focus();
		}
	}

	/* preload images */
	if (document.images) {
		var spacerOn = new Image();
		spacerOn.src = "images/spacer.gif";
	}